36166301221 has 2 divisors, whose sum is σ = 36166301222. Its totient is φ = 36166301220.

The previous prime is 36166301207. The next prime is 36166301231. The reversal of 36166301221 is 12210366163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26279976321 + 9886324900 = 162111^2 + 99430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36166301221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36166301231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18083150610 + 18083150611.

It is an arithmetic number, because the mean of its divisors is an integer number (18083150611).

Almost surely, 2^36166301221 is an apocalyptic number.

It is an amenable number.

36166301221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36166301221 is an equidigital number, since it uses as much as digits as its factorization.

36166301221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

Adding to 36166301221 its reverse (12210366163), we get a palindrome (48376667384).

The spelling of 36166301221 in words is "thirty-six billion, one hundred sixty-six million, three hundred one thousand, two hundred twenty-one".